<!DOCTYPE html>
<link rel='match' href='float_positioned_pseudo_stacking_context_ref.html'>
<style>
  html, body {
    margin: 0; padding: 0;
  }
  div {
    width: 100px;
    height: 100px;
  }

  #a {
    position: absolute;
    top: 20px;
    left: 20px;
    background: red;
  }

  #b {
    float: left;
    position: relative;
    background: green;
  }
</style>

<body>
  <div id="a"></div>
  <div id="b"></div>
</body>

